Types of Reactions

Question 1

Exothermic Reactions

Answer 1

Release energy when the reaction occurs through heat. Examples: Combustion, Neutralisation

Question 2

Endothermic Reactions

Answer 2

Absorb energy from surroundings during reaction and has a reduced temperature. Examples Electrolysis, Photosynthesis

Question 3

Decomposition Reactions

Answer 3

A reaction where one reactant is broken into smaller products. AB → A + B

Question 4

Combustion Reactions

Answer 4

A reaction where an element or compound violently reacts with oxygen to form a product usually releasing energy in the form of heat. A + 02 → AO + Energy
Complete Combustion - (Hydrocarbon + oxygen → carbon dioxide + Water)
Incomplete Combustion - (Hydrocarbon + oxygen → Carbon monoxide + carbon + water)

Question 5

Corrosion Reactions

Answer 5

When an element or compound combines with oxygen to form a product usually occurs with metals. Corrosion can also occur with hydroxides and sulfides, but generally, it is the oxidation of metals (not necessarily a reaction between oxygen) where refined metals are converted into more chemically stable oxides/sulfides. (oxidation of metals). A + 02 → AO

Question 6

Precipitation Reactions

Answer 6

When two aqueous chemicals combine to form an aqueous liquid and an insoluble solid called a precipitate. AB (aq) + CD (aq) → AD (aq) + BC (s)

Question 7

Neutralisation

Answer 7

When an acid and base combine to form 2 neutral products. A(OH) + HB →AB + H2O (AB is a salt)

Question 8

Acids

Answer 8

Form a hydrogen ion in solution. Proton donors that release hydrogen into the other reactant. Stronger acids release more protons

Question 9

Bases

Answer 9

Forms hydroxide ions in solution. Proton receivers that take protons released by the acid and turns into forms of hydroxide neutralising the acid. The stronger the base the more hydroxide is created.

Question 10

Synthesis Reactions

Answer 10

Reactions where two or more reactants combine to make one complex product. A + B → AB

Question 11

Respiration Reactions

Answer 11

A chemical process where organic compounds release energy. Aerobic respiration requires oxygen and releases lots of energy. Anaerobic releases less energy. Along with combustion, they both release energy but respiration is at a slower rate and doesn’t release as high levels of heat energy.

Question 12

Single Displacements

Answer 12

AB(aq)+C → A+CB(aq) A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.

Question 13

Double Displacements

Answer 13

AB ​​+ C​​D​→A​​​D​ ​​+ C​​​B Double replacement reactions—also called double displacement, exchange, or metathesis reactions—occur when parts of two ionic compounds are exchanged, making two new compounds.